World World’s first 3D printed steel bridge weighing 4.9 tons opens to public in Amsterdam July 23, 2021July 25, 2021Gabriela Miranda, USA TODAYComments Off on World’s first 3D printed steel bridge weighing 4.9 tons opens to public in Amsterdam On July 15, the world's first 3D printed steel bridge created by the Imperial College London was unveiled in Amsterdam. It weights 4.9 tons.